Conveyer apparatus



Oct. 21, 1952 H. BILTERMAN CONVEYER APPARATUS 2 SHEETS-SHEET 1 Filed March 23, 1950 E v. m m w M A f v m m N 5 LV \N Oct. 21, 1952 H. BILTERMAN 2,614,707

' CONVEYER APPARATUS Filed March 23, 1950 2 SHEETSSI-IEET 2 Fad \ //v vs/v we I H 1.. 5/1. TEE/WAN HTTK Patented Oct. 21, 1 952 UNITED STATES PATENT OFFICE I 1 YCONVEYEB APPARATUS I Henryl'i Bilterman, Chicago, IlL, assignor to WesternElectri'c Company, Incorporated, New YorlqN'. $5., a; corporation of New. York.

'ApplicationMa'r'ch 2a, 1950, Serial nm'ismar This invention relates torconveyor apparatus and more particularly to apparatusfor controlling the feeding of granular materials as needed to api'urality of receptacles.

In previous apparatus for controlling the feeding of. granular materials, such as sand being;

fed to molders hoppers in a foundry, the con-- struction of the hoppers or receptacles with respect to the main supply conveyor has been such that an end receptacle was providedto receive all of the material which was not deflected intoany of the preceding receptacles. Such an ar rangement is, at times, undesirable since it is possible that the end receptacle may be filled to overflowing while some of the preceding receptacles still need sand, in which case any sand left on the main conveyor after the preceding receptacles have been supplied-will be deposited in the end receptacle regardless oftheiact that it .is already full. This condition results in sand being wasted or spilled on the foundry floor.

It" is an object of the'present invention to proserves to deflect sand from the belt into the as'- sociated bin. Switch mechanisms sensitive; to

the pressureoi the sand with-in the bins are so arranged in the bins that circuits are completed to maintain the plows in. operative sand-deflecting positions until a predetermined amount of sand is depositedin each of the bins, whereupon the circuits are broken and, after'a predetermined time interval, the plows are withdrawn from their operative positions.

This invention obviates the difficulty just described by providing a control circuit wherein the deflecting plows are maintained in their operative positions for a predetermined length of time after their respective pressure-sensitive switches have been actuated in order that the patch of sand between the" operated plow and the next preceding operated plowfmay be deflected intothe receptacle whose pressure responsive switch has been actuated. Sacha system elimi 7" Claims. (Cl. 214 -17)- nates the necessity for an end receptacle to receive any sand left on the conveyor since in this arrangement no sand will remain on the conveyor after its coursehas run past the last receptacle providedwith a deflector. A solenoid actuated stepping switch arrangement, consisting of two banks, of stepping switch contacts, is provided to cooperate'with, the several bin control pressure responsive switch mechanisms and control the plow circuits so that the plows may be operated in sequential order. Furthermore, the circuits are so arranged that the stepping switch contacts, when connected to a pressure responsive switch indicating a full receptacle, are immediately moved to the contacts associated with the next preceding receptacle.

' A more complete understanding of the invention may be had by reference to the following detailed description when considered in conjunction with the accompanying drawings, wherein Fig. 1 is a fragmentary schematic side view of a sand conveying and distributing apparatus embodying the features of this invention and showing three intermediate units of the apparatus;

Fig. 2 is a plan view of one unit of the apparatus shown in Fig. 1;.

Fig. 3 is an enlarged vertical sectional View of one of the pressure responsive switches taken along line 3-53 of Fig. 1; and

Fig. 4 is a circuit diagram. showing the means for controlling the various units of the sand conveying and feedinglapparatus and the operation of the entire apparatus.

Reierringto the drawings, with particular reference to Figs. 1, 2' and 3-, there is provided an endless conveyor in the form; of a belt [0, on which granular material H, such as sand in the presentinstance, hasbeen deposited at its. left end (Figs. 1. and. 2) and is carried in the direction of the arrow l'2. Sand is fed from opposite sides of the belt l0 into a series of spaced molders supply bins supported below the belt.

Any desired number of receptacles or bins may be provided and, for purposes of illustration, three intermediate bins i3, i4 and i5 areshown in Fig. 1 and, for simplicity; the electrical circuit in Fig. 4 has been limited "to the control circuits associated with the bins [3, T4 and i5. The

belt [0 is driven by anysuitable driving means,

opposite longitudinal. edges'oi' the belt it so that'sandpwhen fed iromsuch belt edges, will drop into the bins during the advance of the belt in the direction of the arrow l2. At their lower ends, the bins are equipped with dispensing valves 2 i, which are manually controlled by molders stationed adjacent each bin to cause sand as needed to be supplied by gravity from the bins which, in the operation of the apparatus, are maintained with a predetermined quantity of sand supplied from the belt whenever the supply of sand in any bin falls below a certain level.

Arranged above the plane of the upper length of the belt l0, and in alignment witheach of the bins, is a V-shaped plow 22 having itsclosed end facing in the direction opposite to the direction of movement of the belt and thesand ending in the same number as its particular bin.

Referring in particular to Fig. 4, the mechanismconsists of a pair of stepping switches 41 carried thereon. Each plow 22 iswprovided with rearwardly extending spaced parallel arms 23 44 (Fig. 2) which are pivoted at 25-25"to vertical tatably supported upon the frame work 2'1 and the bins are suspended therefrom. v

A counterweight 3| is adjustably mountedon each of the plow arms 23 and the counterweight serves to prevent the plow 22 from dropping suddenly when released fromits inoperative position to its operative lower position, wherein it defleets sand from the belt l0 into the associated bin. Each of the plow arms 24 is connected to a piston rod 32 of an air cylinder 33, the supply of air under pressure to the cylinder to maintain the plowin its upper inoperative position being controlled by a solenoid operated air valve 34 having its inlet port connected by a conduit 35 to a main source of air under pressure (not shown). A conduit 36 connects the air cylinder 33 with the valve 34, which conduit supplies air to the cylinder through the valve and also serves as an exhaust conduit from the cylinder into the valve and through an exhaust conduit 31 of the latter to atmosphere. When the solenoid of the air valve 34 is energized, the supply of air under pressure-to the cylinder 33 is cut ofi by the valve and the plow 22 falls by gravity under control of the counterweight 3|.' Upon deenergization of the solenoid of the air valve 34, the valve is actuated to cause airunder pressure to flow and operate the piston in the cylinder 33, which moves down and by means of the piston rod 32 connected thereto, theplowis moved about its pivots 255-25 to its upper inoperative po-' sition, where it remains until the solenoid of the air valve 34 is again energized.

Each of the bins is provided with a pressuresensitive switch mechanism 40, which is shown diagrammatically in Fig. 3. The switch mechanism 49 consists of a circular diaphragm 4| of suitable flexible material'which is sealed and se-' the diaphragm 4| is a switch actuating member 44 arranged to make and break contact with a set of normally open contacts 45." A cup-shaped cover 46, attached to the outer face of the bin,

serves to enclose the switch mechanism '40.

The circuit for controlling the apparatus of Figs. 1 and 2 is shown in Fig. 4 and will now be and 48 having movable contacts 49 and 50, respectively, when contacts are movable angularly in tandem through single steps or increments by means of a stepping switch operating coil 5|,

which alon'g'with the rest of the circuit is energized from a voltage source 52. The stepping switch 4! has a number of fixed contacts 53, 54, 55 corresponding in number and sequence to the number of bins to be served, and the stepping switch 48 likewise has a set of fixed contacts 53, 64, 65. Each of the contacts 53, 54, 55 is connected to a set of the normally opened pressure responsive switch contacts shown in Fig. 3, and again for simplicity the particular contacts are redesignated I3, 14, 15. It is to be understood that each of the setsof contacts 13, I4, 15 are similar to the set of contacts shown in Fig. 3 and each of the pressure-sensitive switch contacts l3, i4, 15 has one side thereofconnected directly to one side of the voltage source 52. The other side of each of the pressure-responsive switch contacts, in addition to being connected 7 to the fixed contacts 53, 54, on the stepping in turn closable by energization of a relay operat-- ing coil 98 which is also in series with the normally closed contacts 96, the parallel connected. contacts 93, 94, 95 and the movable contact 49 switch 41, is also connected to one side of auxiliary relay operating coils 83, 84, 85, and the other side of the auxiliary relay operating coils B3, 84,

are connected to the other side of the voltage source 52. that a bin has a sufficient supply of sand, its pressure-sensitive switch contacts are closed, thereby energizing its auxiliary relay operating coil. Each of the auxiliary relayoperating coils 93, 84 andv 85 seperately controls a first set of normally closed contacts 93, 94, 95, respectively, which lat-' ter contacts are connected in parallel, withthe parallel connected contacts all being connected in. series to the movable contact 49 on the step;

ping switch 41.

The movable contact 49 also has connected series therewith, a pair of normally closed contacts 96, which are adapted to be opened by energization of the stepping switch operating coil 5|. The stepping switch operating coil 5|, which is connected directly acrossthe voltage source 52, is energizable by closure of a set of normally.

opened contacts 91 connected in series with the operating coil 5|. The set of contacts 91 are on the stepping switch 4'1. Thus it will be seen that any time the movable contact 49 is in con-' tact with one of the fixed contacts 53', 54,55, as-, sociated with a closed pressure responsive switch contact 13, 4, 15, the relay operating coil 98 will be energized, thus closing its contacts 91 and causing the stepping switch operating coil 5| to be energized. Energization of the stepping switch operating coil 5| causes the stepping switches 41, f 48 to be stepped in tendem to the next set of fixed contacts'and at the same time, breaks the} Thus it will be seen that any time genoe closedpressure-responsive switch contact-.-

l t wi ll be observed here, that one of the functions of the auxiliaryrelay operating? coils 83,

v 84, 85, is to control the parallel connected contacts 93 9'4,- 95 in such a mannemthat if at any time all of the pressure responsive switch contacts 13-, 14,15 indicate that all-of the bins are supplied with sand, all of the contacts 93', 94 95 will. be opened-thereby completehr disabling the stepping; eha nim The general function-oil the circuit described thus far in connectionwith the stepping switch. cars to cause-the stepping switches 41,48 to step in' anorderly fashion to continuously seek'out an empty binpand a further function is to. disable the stepping mechanism completely whenever all. of the-bi ns are full. x I

That part of the circuit now to be described. is primarily: concerned with the actual raising and lowering oftne plows 2-2; iwhich are individual to thebins," As has been disclosed before, each. of

. the plows 22 is provided with. separate means for moving the plows into and out of. operative or sand'defiecting position. and this mechanismcon sists of-a solenoid operated air valve. 34- associated. witheach-plow. Each of the solenoid operated air valves '3 4 is provided with. a separate actuatingsolen'oid I03,- I04, I05, and the: function of the circuit now to. be described iscto insure that the-"solenoids l03, I04, l05'arie: energized and de-- energized at thei proper time; Each. of the-:solee noids I03, I04, I05 isva'dapted to beenergizedsby;

closure of a set of normally opened contacts 'I I3, H4 and I15, which contacts are connected. in series with the solenoids I03. I04, I05,directlyacross thevoltage source 52. The contacts H3, H4, H5, are closable by energization of solenoid operating relays having operating coils I23, I24,. I25. The operating coils I23, I24,, I25 are connected through sets of normally closed contacts I33, I34, I35 to the fixed contacts 63, 64 B5 on ing supplied in the order-tram the tin most re mote from the sand suppl ying' position at the beginning of the run of the belt ill to the bin nearest thesand supplying position at the beginning' of the run of the belt- I0, itis necessary that each of the plows remain in material defleeting position for a length of time sufilcient to insure that the patches of sandbetween the plow in deflecting position and the plow which is nextmoved into deflecting position, is actually re moved from the belt before. it reaches the end of its course. Since-the operating coils I23, I24, I25 when energized cause the solenoids I03, I04, 105 120: move their associated plows into deflecting.

positionand hold them there-and since the op era-ting'coils I23, m, I25 would otherwise i'mmediately' deenergized by the closing or: the associated" pressure-responsive switch. contacts 73', I4,- 'I5 due to theimrnediate steppingof' the. stepping switches 41 and 48, a. locking circuit'is provided to maintain the operating coils I23, H4, I25 energized after stepping of the stepping switchesand this locking circuit consists of a set of normally openedcontacts I' 43, I 44-, I 45'under' control of the operating coils I23, I24, I25 and. connected in series therewith across the voltage supply 52. Thus the operating coils. I23, I24, I25 are not deenergized until a set of normally closed timer contacts I53, I54, I55 also connected in. series with the operating coils- I23, I 24:, I 25 are opened andthat pa'rt of thecircuit nowto be: de

th'estepping switch 48,v and the movable contact on the stepping switch 48 is connected directly to one side of the voltage source 52.. The norniallytclosed contacts I33, I34, I35 are controlled by'the' auxiliary relay operating. coils 83, 84,. 85 in: the steppingxcircuit, and. it will be observed,

' therefore, that simultaneous stepping of the movable-. contacts 49 and 50 into contact with fixed stepping switch contacts associated with an open pressure-responsive switch. will cause theassociated operating coils I23, I24, I25 to be energized through the-stepping switch 48,-and therefore, a set of the contacts I.I3, I I4, I I5to the associated solenoids I03, I04, I05 will be closed to cause the associated plow 22 to be lowered into' position to deflect sand into the bin. having the opened pressure-responsive contacts. 1 As has been explained. previously, the belt I0 is-being continuously supplied with sand. Since this condition prevails, it is necessary that steps be taken to insure that none of the sand reaches" the endof the conveyor, since such would result ihthefsandbeing deposited on the foundry floor. The possibility of suchan occurrence is elimi nated by the use of a special locking and timing circuitwhich will be described hereinafter. Since the stepping switches are stepping in reverse order? or i n -other words; since the; bins arev been.

scribed'has' as its purpose, the provision of suitable time delayperiodsbetween the time of closing of a pressure sensitive switch and the time its. associated plow is raised.

In'order to provide 'for'the proper time delay" as described above,= aseries of timers having their energizing contacts I63-I 64-I 65 connected directly across the voltage supply 52 are provided; Thus the timers are alwaysconditioned to perform a timingoperation. The functionof the timers is to cause the plow associated with each timert'oremain'in its downward or operative: position 'for' a length of time sufiicient to remove all offthe'sand remaining on the belt after the associated pressure responsive switch is closed." In order to function in this manner; the timers are set; for progressively shorter time intervals with thetimer closest to the sand supply and of the conveyor being set for the shortest time interval. It is necessary that each timer be set'to allow 'itsassOciated plow to remove all of the sandremaining on the conveyor belt at the time of closing of its associated pressure responsive switch conta cts, because 'itis possible that none or; the other bins will need sand at this time. In other words, it is not,v sufficient that each timer be set to cause its plow to merely remove that portion. of the sandfremaining between its plow an'dithe next succeedingpl'ow, since it is possible that. the, succeeding. plows will notice lowered due to 'a suffi'cient quantity of sand being present in their bins.

The timers are provided. withIactuating con-=- tacts [13-1 'I'4--.I"I5,. which latter contacts are adapted. to be energized by either one ofi'two alternate paths, and energization of the contacts. IJ3I'I4I'15 causes the timer to begin its timing operation at the. end of which its contacts I=53'-I54- -I55 are opened to cause deenergization of solenoid, operating coils 'I2.3-I2.4-I25-.- which action breaks the locking. circuit'atcontacts I-43-1- -I44.--I45 and also breaks the circuit; at II-3-.-I I.4- --I I5; to solenoids I03-'I 0-4--I 05, and tnerebr.-. causes-zthe associatedgn cntc be The :paths through which the actuating contacts 113-114-115 on the timer may be energized, are connected in parallel and include a single path having the normally opened pressure-responsive switches 13-14-15 connected in series therewith, and another path having two sets of normally opened contacts 183-184-185 and 193-194-195 connected in series therewith. The set of normally opened contacts 183-184-185 are controlled by the solenoid operating coils 123-124-125, and the set of contacts 193-194-195 are controlled by the auxiliary relay operating coils 83-84-85. It will thus be observed that immediately upon energization of any one of the operating coils 123-124-125 and consequent lowering of its associated plow, the associated contacts 183-184-185 will also be closed to prepare a circuit to the actuating contacts 113-114-115 on the timers. Upon closure of the associated pressure-responsive switch 13-14-15, the timer is immediately actuated, and thus starts its timing cycle. At the same time, the auxiliary relay 83-84-85 associated therewith is energized, thus. completing the circuit to the; timer actuating contacts at contacts 193-194-195. This action not only assures continued energization ofthe actuating contact 113-114-115, but also locks the associated auxiliary relay 83-54-85 in its operated position. The timer, therefore, will continue its cycle until it has timed out, at which time, its contacts 153-154-155 open to cause the associated plow to be raised. It is necessary that the timer actuating contacts be connected through the contacts 183-184-185,,193-194-195 because if the timer actuating contacts were only connected to the pressure-responsive switches 13-14-15, it would be possible, in a case where an operator removed sand from a bin at the approximate time when the pressure-responsive contact associated with the bin was closed, for the timer to fail to operate through its complete cycle due to premature opening of the pressure-responsive contacts, in which case the plow would not be raised. It is to be noted that the timer is of the type wherein its contacts 153-154-155 are normally closed and remain normally closed until the timer actually times out, at which time the contacts open momentarily and the timer'then resets automatically.

Under certain circumstances in the actual operation of foundries or the like, it is sometimes desirable to disable one or more of the molders' positions. In order t'oprovide for such a contingency, each of the pressure-responsive switches 13-14-15 is provided with a shunting switch 203-204-205 which may bemoved to its closed position and thus disable the associated bin. This action is accomplished by virtue of the fact that the movable stepping switch contact 49 momentarily connected to a closed shunting switch 203-204-255 will be immediately stepped to its next position.

Referring again to Fig. 1, it will be noted that the schematic diagram indicates the plows 22 associated with bins 14 and 15 being in their lowered positions. when the bin 15 has been provided with sufilcient sand to cause its pressure-responsive switch to close, at which time the movable contact 49 is stepped to a position wherein it is associated with the pressure-responsive switch 14 associated with bin 14. In this case, bin 14 has also indicated a need for sand, and consequentlmthe plow 22 associated therewith has been lowered. Dueto the "timing circuit described hereinbe- Such a condition prevails fore, the plow 22 associated with bin 15 remains in its lowered position long enough to remove the sand remaining between bins l4 and 15 on the belt 10.

In a situation where all of the molders bins have a sufficient supply of sand therein, it is obviously undesirable for sand to be moved along the conveyor since it, would result in the sand being deposited on the foundry floor. Ordinarily, it is undesirable to stop the conveyor under such conditions, but instead, the sand normally being fed to thecconveyor is deflected back into the sand preparing mechanism. In order to provide an operator with a warning system whereby he cancause the sand to be properly deflected from the conveyor, a group of pilot lights 213-214-215 are connected in shunt with the auxiliary operating coils 83-84-85. It will thus be obvious that if at any time all of the. bins indicate that they have a sufficient supply of sand, all of the pilot lights 213-214-215 :will be lighted, thus giving the operator a visual signal to stop the feeding of sand to the conveyor.

Throughout the description of the apparatus, such description has been confined to foundry operation and the supply of molding sand to operators positions. It is obvious that the arrangement disclosed and described herein may also be used to advantage in the handling of many other types of granular materials, and the arrangement having been described in connection with a foundry purely for purposes of simplicity.

It is to be understood that the above-described arrangements are simply illustrative of the apaplication of the principles of the invention.

Numerous other arrangements may be readily devised by those'skilled in the art which will embody the principles of the invention and fall within the spirit and scope thereof.

What is claimed is:

1. In a system for handling granular material, an endless belt conveyor, a plurality of material receiving stations adjacent the conveyor, material deflecting means individual to each station movable into material deflecting position with respect to the conveyor to supply each station with material, material responsive switches individual to each station and closable in response to the presence of a predetermined amount of material thereat, a first and a second stepping switch connected in' tandem and having a number of fixed contactscorresponding in number and sequence with said material responsive switches, means connecting each of said material responsive switches to its corresponding fixed contact on said first stepping switch,"a movable contact on each stepping switch movable into contact with each of said fixed contact-s in sequential order, a stepping switch actuating relayresponsive to contact of themovable contact on said first steppin switch with-a fixed contact associated with a closed material responsive switch to cause said stepping switches to be stepped one increment, solenoids individual to each of said deflecting means ener-' gizable to move the deflecting means into material deflecting position, solenoid actuating relays individual to each solenoid and having their opera-ting .ccils connected to the individual fixed contacts on said second stepping switch, auxiliary relays individual to each material responsive switch and having their operating coils in parallel with thecontacts on said first stepping switch, normallyclosed contacts on each auxiliary relay interposed in the circuit between itsassociated solenoid actuating relay operating coil and its each timer interposed'in its associated solenoid r actuating relay circuit to cause its associated material deflector to be raised a predetermined time interval after energization of the timer, and an auxiliary circuit to each timer tending to maintain it energized until the solenoid actuating relay is deenergized.

2. Apparatus for handling granular material including a movable endless conveyor, a plurality of receiving stations adjacent said conveyor, material deflectors individual to each station for transferring material from the conveyor to the stations, power means to move the deflectors into and out of transferring position, material responsive switches at each station closableby presence of a predetermined amount of material at each station, a pair of stepping switches, means associated with the first of said stepping switches responsive to a closed material responsive switch momentarily connected thereto to cause said stepping switches to be stepped in tandem to their next position, means associated with the second of said stepping switches to move one of said defiectors into transferring position in response to an open material responsive switch in the circuit to the first stepping switch, and timing means 'to cause said deflectors to be held in material trans ferring position a predetermined length of time after closure of their associated material responsive switches.

3. In material handling apparatus including a conveyor and a plurality of material receiving stations adjacent thereto, the combination of material responsive switches at each station, material transferring means at each station for trans ferring material from the conveyor to the station, a first stepping switch having its contacts sequentially connected to the material responsive switches, individual means to move said material transfer means into position, a second stepping switch having its contacts sequentially connected to said individual means, means responsive to each closed material responsive switch to step said stepping switches in tandem to-the next contact, means responsive to an open material responsive switch momentarily connected through said first stepping switch to actuate one of said individual means to move its associated transferring means into position, and individual timing means actuable upon closure of its material responsive switch to render its material responsive switch inoperative to remove its transferring means for a predetermined length of time after closure thereof.

4. In a system for handling granular material,

' first and a secondstepping switch each having a plurality of fixed contacts and a single movable contact, means connecting each material responsive switch to one of said fixed contacts on said 10 first stepping sweethearts 'for stepping said stepping switches in tandem, means responsive to movementof thefirst stepping switch movable contact engagement with-'a fixed contact connected toa closed material responsive switch to actuatesaid-stepping means through one inc'rem'ent, means responsiv -(to movement of the first? stepping 'switch movable contact into engagement-with fitted conraer'cohnectearo an open materniresponsive f switch to temporarily disable said stepping means, electromagnetic means to initiate actuation of the material deflector individual to the receptacle containing said open material responsive switch, said electromagnetic means being connected through the contacts on said second stepping switch, and timing means initiated by closure of each material responsive switch'to delay removal of each material deflector from deflecting position for a predetermined length of time after closur e'of its a sociated material responsive switch.

5.-Apparatus for conveying granular material to a plurality of consecutively arranged receiving stations comprisin ayc-onvey-or having its course adjacent the stations, a separate material responsive switch associated with each receiving station, each of said switches being operable by the contacts of said first steppin switch to cause 1 advancement, of said stepping switches in response to aclosed material responsive switch momentarily associated therewith, means connected through said second stepping switch tocause the material removingmember'momentarily associated therewith to be moved into materia1'removing position, and means responsiv to each'closed material responsive switch to disable the associated means for moving'the material removing" member into removing position.

6. In asystem of the character described, the combination of an endless conveyor for supplying material, a plurality of receptacles for receiving the material I from the conveyor, movably mounted deflectors for discharging material from the conveyor into the receptacles respectively, means for shifting the deflectors into and out of their operative positions controlled by the material in the receptacles respectively, a stepping switch rendering said shifting meansoperable in succession in response to. absence of a predetermined amount of material in the instant receptacle, a second stepping switch, means associated with said second switch to step said switches in tandem to their next succeeding position in response to presence of a predetermined amount of material in the instant receptacle, and timing means to holdan operated deflector in its operative position for a predetermined length of time after said switches aresteppedn i 7. In a control circuit for controlling the feed of material to a plurality of receptacles positioned adjacent a travelling conveyor belt, the combination of a pressure sensitive switch in each of the receptacles, an auxiliary relay individual to each receptacle and having its coil in serie with the pressure sensitive switch in each receptacle, a

lay, a first stepping switch havingits contacts 5 connected sequentially to the operatingcoils of said solenoid operating relays, a second stepping switch, means associated with said second stepping switch to cause said steppin switches to be stepped in tandem through one increment in re- 10 12 sponse to each closed pressure sensitive switch associated with said second stepping switch, and means individual to each of said solenoids and operable under the control thereof for directing material from the conveyor belt to its associated receptacle.

HENRY L. BILTERMAN.

No references cited. 

